英语六级100条阅读难句分析-sentence 91

　　While warnings are often appropriate and necessary--the dangers of drug interactions, for example--and many are required by state or federal regulations, it isn’t clear that they actually protect the manufacturers and sellers from liability if a customer is injured.

　　【词汇突破】appropriate：恰当的，合适的

　　liability：责任(duty，obligation,commitment 的同义替换词)

　　【主干识别】it isn"t clear that +主语从句(it 为形式主语)

　　【其他成分】while warnings are often approprite and necessary and many are required by state or federal regulations让步状语从句;the dangers of drug interactions, for example.插入语;that they actually protect the manufacturers and sellers from liability宾语从句;if a customer is injured条件状语从句。

　　【微观解析】由while引导的时间状语从句中，大的并列可还原为while warnings are often…and many warnings are required…

　　【难点揭秘】各种从句交织在一起会导致主干模糊，其中也包括出现插入语的现象

　　【译文赏析】尽管警告常常是适当而且必须的--比如对于药物相互作用的危险提出警告--许多警告还是按州或联邦政府规定要求给出的

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